22-50444039-C-T

Variant names:

• chr22-50444039-C-T
• rs765174979
• NM_001242898.2:c.2753C>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001242898.2(PPP6R2):​c.2753C>T​(p.Ala918Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000273 in 1,613,056 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000027 (0 hom.)
• Consequence: PPP6R2 NM_001242898.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.00200

Genes affected

PPP6R2 (HGNC:19253): (protein phosphatase 6 regulatory subunit 2) The protein encoded by this gene is a regulatory protein for the protein phosphatase-6 catalytic subunit. Together, these proteins act as a significant T-loop phosphatase for Aurora A, an essential mitotic kinase. Loss of function of either the regulatory or catalytic subunit of protein phosphatase-6 interferes with spindle formation and chromosome alignment. [provided by RefSeq, May 2017]

SBF1 (HGNC:10542): (SET binding factor 1) This gene encodes a member of the protein-tyrosine phosphatase family. However, the encoded protein does not appear to be a catalytically active phosphatase because it lacks several amino acids in the catalytic pocket. This protein contains a Guanine nucleotide exchange factor (GEF) domain which is necessary for its role in growth and differentiation. Mutations in this gene have been associated with Charcot-Marie-Tooth disease 4B3. Pseudogenes of this gene have been defined on chromosomes 1 and 8. [provided by RefSeq, Dec 2014]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05757928).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PPP6R2	NM_001242898.2	c.2753C>T	p.Ala918Val	missense_variant	Exon 23 of 24	ENST00000612753.5	NP_001229827.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPP6R2	ENST00000612753.5	c.2753C>T	p.Ala918Val	missense_variant	Exon 23 of 24	2	NM_001242898.2	ENSP00000478417.1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152210 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000364 AC: 9 AN: 247248 Hom.: 0 AF XY: 0.0000372 AC XY: 5 AN XY: 134500

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000870

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000466

Gnomad NFE exome AF: 0.0000180

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.0000274 AC: 40 AN: 1460846 Hom.: 0 Cov.: 31 AF XY: 0.0000275 AC XY: 20 AN XY: 726738

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000895

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000190

Gnomad4 NFE exome AF: 0.0000261

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152210 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74352

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000142 Hom.: 0

Bravo AF: 0.0000416

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Oct 08, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2753C>T (p.A918V) alteration is located in exon 23 (coding exon 21) of the PPP6R2 gene. This alteration results from a C to T substitution at nucleotide position 2753, causing the alanine (A) at amino acid position 918 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	9.2
DANN	Benign	0.96
DEOGEN2	Benign	0.0021	.;.;.;.;T
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.70	T;T;T;T;T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.058	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.90	.;.;.;.;L
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.35	N;.;N;N;N
REVEL	Benign	0.017
Sift	Uncertain	0.011	D;.;D;D;D
Sift4G	Benign	0.40	T;T;T;T;T
Polyphen		0.0090	B;B;B;B;B
Vest4		0.21
MutPred		0.38		.;.;.;.;Gain of sheet (P = 0.0221);
MVP		0.068
MPC		0.012
ClinPred		0.028	T
GERP RS		-0.084
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.041
gMVP		0.16

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs765174979; hg19: chr22-50882468; COSMIC: COSV53299985; COSMIC: COSV53299985;